Matthew Zhang

Autofocus is easily one of the most useful advances in modern photography. In the majority of current camera systems, not having autofocus is nearly...

Colour is something that we human beings take for granted. It is a basic element of existence, like gravity or bad pop music, that we instinctively...

Diffraction is when the regular pattern of waves we see as light gets disrupted and behaves erratically. Most photographers understand depth-of-field and how...